Mathias Weidner > Algorithm-CheckDigits > Algorithm::CheckDigits::M10_006

Algorithm-CheckDigits-v1.3.2.tar.gz

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Module Version: v1.3.2

# NAME

CheckDigits::M10_006 - compute check digits for Rentenversicherung (DE)

# SYNOPSIS

```  use Algorithm::CheckDigits;

\$rv = CheckDigits('rentenversicherung');

if (\$rv->is_valid('65180539W001')) {
# do something
}

\$cn = \$rv->complete('65180539W00');
# \$cn = '65180539W001'

\$cd = \$rv->checkdigit('65180539W001');
# \$cd = '1'

\$bn = \$rv->basenumber('65180539W001');
# \$bn = '65180539W00'```

# DESCRIPTION

## ALGORITHM

1. The letter is replaced with a two-figure number appropriate to the position of the letter in the german alphabet.
2. Beginning left all numbers are weighted with 2,1,2,5,7,1,2,1,2,1,2,1.
3. The the total of the digits of all products is computed.
4. The check digit is sum from step 3 taken modulo 10.

## METHODS

is_valid(\$number)

Returns true only if `\$number` consists solely of numbers and the last digit is a valid check digit according to the algorithm given above.

Returns false otherwise,

complete(\$number)

The check digit for `\$number` is computed and concatenated to the end of `\$number`.

Returns the complete number with check digit or '' if `\$number` does not consist solely of digits and spaces.

basenumber(\$number)

Returns the basenumber of `\$number` if `\$number` has a valid check digit.

Return '' otherwise.

checkdigit(\$number)

Returns the checkdigit of `\$number` if `\$number` has a valid check digit.

Return '' otherwise.

None by default.

# AUTHOR

Mathias Weidner, `<mamawe@cpan.org>`

perl, CheckDigits, www.pruefziffernberechnung.de.

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